Contains the personal papers of Clark, including his diaries, daily planners, scrapbooks, high school yearbooks, photographs, letters, sound recordings of his speeches, and transcripts of his diaries created by children. Dated approximately 1896 to 1985.

Contains family records, diaries, family histories, photographs, and other materials collected by Clark relating to his life and the Clark and Noble families. Materials date from between 1896 and 1981.

Contains printed transcripts of diaries, letters, and other materials created by Harold Glen Clark. The transcripts were created by Clark's children. The majority of the transcripts are from Clark's diaries, while others are categorized by subjects, including his mission to Sri Lanka, temple work, and photographs taken from the collections. Materials dated 1902 to 1979.